1 files changed, 13 insertions, 1 deletions
diff --git a/util.c b/util.c
index 5ab9c48..43c3d8b 100644
--- a/util.c
+++ b/util.c
@@ -10,15 +10,27 @@ static void vwarn(const char *fmt, va_list ap) {
   }
 }
 
-void fatal(const char *fmt, ...) {
+void lfatal(const char *fmt, ...) {
   va_list ap;
+  fprintf(stderr, "%ld: ", curlineno);
+  va_start(ap, fmt);
+  vwarn(fmt, ap);
+  va_end(ap);
+  exit(1);
+}
 
+void fatal(const char *fmt, ...) {
+  va_list ap;
   va_start(ap, fmt);
   vwarn(fmt, ap);
   va_end(ap);
   exit(1);
 }
 
+void unreachable(void) {
+  lfatal("BUG: unexpected internal condition");
+}
+
 void *xmalloc(size_t n) {
   void *p;